How does it work anyway? I mean, how does Firefox make money? Are they paid per google search or something like that?
And, do they make money if I use forks of firefox and use Google on them?
And, what are the total number of active users for Mozilla and do the forks account into this count?
You don’t have to use Google at all. They are pretty ubiquitous, so you have to make a little effort - search with another tool (I find duckduckgo to be quite satisfactory). Although Youtube has the lion’s share of the video, there are other places to go. It is the same with all Google products.